Model of a branched microbial active carpet of tailed swimmers (black). Red and blue show nutrient flow towards and away from the swimmers, respectively.

From the article:

Nutrient Transport Driven by Microbial Active Carpets
Arnold J. T. M. Mathijssen, Francisca Guzmán-Lastra, Andreas Kaiser, and Hartmut Löwen
Phys. Rev. Lett. 121, 248101 (2018)

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